The bingo sites are quite easy to use and the uk sites seem to be quite alright regarding use of the credit card. There are sites where you can play games for nothing and the points you accrue can be put in a draw for cash prizes, e.g. play and win. There is also a site called triviala where you play for free but can win question of the day if you answer correctly (£20 and I have won it once). You also get crowns which can be entered in weekly draws for money. I would beware of casino type sites which usually have very stringent rules on getting money out. This question may be better placed in Gaming.